<template>
    <div>
        <!-- inline表示行内表单,代表一行可以放置多个表单元素 -->
        <el-form :inline="true" class="demo-form-inline" :model="cForm">
            <el-form-item label="一级分类">
                <el-select placeholder="请选择" v-model="cForm.category1Id" @change="handler1" :disabled="show">
                    <el-option :label="c1.name" :value="c1.id" v-for="(c1, index) in list1" :key="c1.id"></el-option>
                </el-select>
            </el-form-item>
            <el-form-item label="二级分类">
                <el-select placeholder="请选择" v-model="cForm.category2Id" @change="handler2" :disabled="show">
                    <el-option :label="c2.name" :value="c2.id" v-for="(c2, index) in list2" :key="c2.id"></el-option>
                </el-select>
            </el-form-item>
            <el-form-item label="三级分类">
                <el-select placeholder="请选择" v-model="cForm.category3Id" @change="handler3" :disabled="show">
                    <el-option :label="c3.name" :value="c3.id" v-for="(c3, index) in list3" :key="c3.id"></el-option>
                </el-select>
            </el-form-item>
        </el-form>
    </div>
</template>
<script>
export default {
    name: 'CategorySelect',
    props: ['show'],
    data() {
        return {
            list1: [],
            //接受二级分类的数据
            list2: [],
            //获取三级分类的数据
            list3: [],
            //收集一级二级三级分类的id
            cForm: {
                category1Id: '',
                category2Id: '',
                category3Id: '',
            }
        }
    },
    mounted() {
        //组件过载完毕之后获取响应的一级分类的数据
        this.getCategory1List()
    },
    methods: {
        async getCategory1List() {
            let result = await this.$API.attr.reqCategory1List()
            if (result.code == 200) {
                this.list1 = result.data
            }
        },
        //一级分类select事件回调,当一级分类option发生变化的时候获取二级分类对应的属性
        async handler1() {
            //清空list2和list3数组
            this.list2 = []
            this.list3 = []
            this.cForm.category2Id = ''
            this.cForm.category3Id = ''
            //结构出一级分类的id
            const { category1Id } = this.cForm
            this.$emit('getCategoryId', { categoryId: category1Id, level: 1 })
            let result = await this.$API.attr.reqCategory2List(category1Id)
            if (result.code == 200) {
                this.list2 = result.data

            }
        },
        //二级分类select事件回调,当二级分类option发生变化的时候获取三级分类对应的属性
        async handler2() {
            this.list3 = []
            this.cForm.category3Id = ''
            const { category2Id } = this.cForm
            this.$emit('getCategoryId', { categoryId: category2Id, level: 2 })
            let result = await this.$API.attr.reqCategory3List(category2Id)
            if (result.code == 200) {
                this.list3 = result.data
            }
        },
        //三级分类的回调
        handler3() {
            const { category3Id } = this.cForm
            this.$emit('getCategoryId', { categoryId: category3Id, level: 3 })
        }
    },
}
</script>
<style scoped></style>
